1979 Honda Cb400/4 MOT Pass Rate
Pass rate for Cb400/4 models manufactured in 1979, based on 55 real MOT test results.
Data from official DVSA MOT testing records
1979 Honda Cb400/4 MOT Analysis
The 1979 Honda Cb400/4 has an MOT pass rate of 90.9% based on 55 tests — well above the UK average for UK vehicles. Cars of this vintage present for MOT with an average of 27,463 miles on the odometer. With a 9.1% failure rate, the 1979 Cb400/4 is rated as "Excellent" for MOT reliability.
The leading cause of MOT failure for the 1979 Honda Cb400/4 is Motorcycle body and structure, responsible for 1.8% of failures. Body and structure failures include excessive corrosion, sharp edges, loose panels, and damage to the vehicle frame. Rust is the primary concern, especially on older vehicles or those exposed to road salt. Typical repair costs range from £100–500+. Motorcycle drive system is the second most common issue at 1.8%.
Top failures specific to 1979 models only. The overall Cb400/4 page may show different rankings.
What Fails Most
What Fails on This Car?
Click a category to see specific failure items.
View as table
| Rank | Failure Category | Rate (%) | Count |
|---|---|---|---|
| 1 | Motorcycle Body And Structure | 1.8% | 1 |
| 2 | Motorcycle Drive System | 1.8% | 1 |
Failures per 10,000 Miles
avg. 27,463 miFor every 10,000 miles driven, this shows what percentage of MOT tests fail for each category. This accounts for how far cars are actually driven, not just raw pass/fail counts.
View as table
| Category | Rate / 10K mi | Raw % | Count |
|---|---|---|---|
| Motorcycle body and structure | 0.66 | 1.8% | 1 |
| Motorcycle drive system | 0.66 | 1.8% | 1 |
Mileage Statistics
Mileage-adjusted failure rate — accounts for how much this model year is typically driven.
About This Data
The 1979 Honda Cb400/4 has an MOT pass rate of 90.9% based on 55 tests — well above the UK average for UK vehicles. Cars of this vintage present for MOT with an average of 27,463 miles on the odometer. With a 9.1% failure rate, the 1979 Cb400/4 is rated as "Excellent" for MOT reliability.
If you own or are considering buying a 1979 Honda Cb400/4, you can expect reliable MOT performance overall. Before your MOT, pay particular attention to motorcycle body and structure: Inspect sills, wheel arches, door bottoms, and the chassis for rust. Surface rust is acceptable but structural corrosion or holes will fail. Check that all doors, bonnet, and boot close securely. With relatively low average mileage of 27,463 miles, many of these vehicles are still in good mechanical condition.
Motorcycle body and structure — 1.8% of failures
Motorcycle body and structure issues account for 1.8% of MOT failures on 1979 Honda Cb400/4 models. Body and structure failures include excessive corrosion, sharp edges, loose panels, and damage to the vehicle frame. Rust is the primary concern, especially on older vehicles or those exposed to road salt. Typical repair costs: £100–500+. Pre-MOT check: Inspect sills, wheel arches, door bottoms, and the chassis for rust. Surface rust is acceptable but structural corrosion or holes will fail. Check that all doors, bonnet, and boot close securely.
Motorcycle drive system — 1.8% of failures
Motorcycle drive system issues account for 1.8% of MOT failures on 1979 Honda Cb400/4 models. Motorcycle drive system issues are a common cause of MOT failure. Regular inspection and maintenance of these components helps ensure your vehicle passes its MOT. Typical repair costs: £100–400. Pre-MOT check: Have this system checked during regular servicing. Look for warning signs like unusual noises, vibrations, or dashboard warning lights.
Based on DVSA anonymised MOT test data (2005–2024). Crown copyright, Open Government Licence v3.0.